There are two reasons it worked: The first is that the nanoparticles were specially made to fly under the radar of the immune system. The second is that they actually had the egg proteins hidden inside.

By smuggling the allergen into the body without setting off the alarm, the mice's immune systems learned that egg protein isn't so bad after all. The same trick could potentially end any allergy.

The researchers are already testing it on mice that are allergic to peanuts. In humans, that's one of the deadliest food allergies.

What's more, the nanoparticles are already on their way to human trials after they were shown to also treat multiple sclerosis, which is also an immune disorder.